The cash outflow to reacquire common stock during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 20
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Name:	us-gaap_PaymentsForRepurchaseOfCommonStock
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Stock Repurchase Program; Treasury Shares (Summary Of Repurchase And Withholding Activity) (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended			6 Months Ended		3 Months Ended		6 Months Ended
	Aug. 24, 2011	Jul. 31, 2011	Aug. 01, 2010	Jul. 31, 2011	Aug. 01, 2010	Apr. 27, 2008 Maximum [Member] 2008 Repurchase Program [Member]	Jul. 31, 2011 2008 Repurchase Program [Member]	Aug. 01, 2010 2008 Repurchase Program [Member]	Jul. 31, 2011 2008 Repurchase Program [Member]	Aug. 01, 2010 2008 Repurchase Program [Member]	Jul. 31, 2011 Restricted Stock [Member]	Aug. 01, 2010 Restricted Stock [Member]	Jul. 31, 2011 Restricted Stock [Member]	Aug. 01, 2010 Restricted Stock [Member]
Number of shares withheld from vested restricted shares		3,583	58,709	22,513	82,087						3,583	58,709	22,513	82,087
Value of Shares withheld from vested restricted shares		$ 101,000	$ 1,026,000	$ 551,000	$ 1,402,000						$ 101,000	$ 1,026,000	$ 551,000	$ 1,402,000
Amount Authorized for Repurchases of Shares						50,000,000
Additional Amount Authorized for Repurchases of Shares under 2008 Program	$ 36,000,000